[Retros] Christmas Contest 2003 of Stuttgarter Zeitung

[Joost de Heer]

> A. Does this mean that white takes back his last move, and instead checkmates 

> *on the move*? Or does he take back his move, makes a move, then black is on 

> move, and white mates next?


First black takes back a move, then white takes back a move, and instead delivers mate.
So what you're looking for is a position in which
(a) White can deliver mate.
(b) White plays another (legal) move, and then black plays (again a legal move), resulting in the diagram position.


> B. Can a pawn be added to this one so that it makes black to move,  then 

> white mates next?


Yes. Or a pawn could be added, so that it makes black to move, and black mates next. And the colour of the pawn to be added can be black or white.

Joost
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